气候变化领域集成服务门户(CCPortal): Plate-Boundary Kinematics of the Afrera Linkage Zone (Afar) From InSAR and Seismicity

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DOI	10.1029/2020JB021387
	Plate-Boundary Kinematics of the Afrera Linkage Zone (Afar) From InSAR and Seismicity
	La Rosa A.; Pagli C.; Wang H.; Doubre C.; Leroy S.; Sani F.; Corti G.; Ayele A.; Keir D.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Studying the mechanisms of interaction between rift segments is key to understanding the kinematics of plate boundaries in continental rifts. However, the spatial and temporal evolution of deformation at rift linkage zones is rarely observed directly. Here, we combine InSAR data spanning 2005–2010 and 2014–2019 from ENVISAT and Sentinel-1 satellites, respectively, with local seismicity from the Afar rift to investigate the plate-boundary kinematics of the Afrera linkage zone, the junction between the Erta Ale and Tat Ali magmatic segments in Northern Afar (Ethiopia). We obtain time-series of cumulative InSAR Line-Of-Sight (LOS) displacements that show deformation is accommodated by a series of active en-echelon faults striking ∼NS and characterized by normal slip associated with a left-lateral strike-slip component. Additionally, we observe spatial variation in fault behavior with stick-slip and creep. The faults in the center of the linkage zone behave primarily in a stick-slip mode (with abrupt fault displacements up to ∼40 mm) and fault motions are associated with earthquakes of ML > 5. Conversely, faults at the edge of the linkage zone, near the magmatic segments, show creep and some stick-slip behavior (with cumulative LOS displacement up to ∼30–40 mm over a ∼5-year period) accompanied by low-level seismicity. Some of the creeping faults are also spatially associated with hydrothermal springs. We interpret that the temporal behavior of the faults in the linkage zone is controlled by the interplay between tectonic extension, high heat flows, and fluid circulation near the magmatic segments where creeping of some faults is favored. © 2021. The Authors.
英文关键词	Afar; InSAR; rift linkage; seismicity; time-series
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187131
作者单位	Dipartimento di Scienze della Terra, Università di Pisa, Pisa, Italy; Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Firenze, Italy; Department of Surveying Engineering, Guangdong University of Technology, Panyu District, Guangzhou, China; Institut de Physique du Globe de Strasbourg, Université de Strasbourg/EOST, CNRS, Strasbourg Cedex, France; Sorbonne Université, CNRS, Institute des Sciences de la Terre de Paris, ISTeP, Paris, France; CNR, Consiglio Nazionale delle Ricerche, Istituto di Geoscienze e Georisorse, U.O. Firenze, Firenze, Italy; Institute of Geophysics, Space Science and Astronomy, Addis Ababa University, Addis Ababa, Ethiopia; School of Ocean and Earth Science, University of Southampton, Southampton, United Kingdom
推荐引用方式 GB/T 7714	La Rosa A.,Pagli C.,Wang H.,et al. Plate-Boundary Kinematics of the Afrera Linkage Zone (Afar) From InSAR and Seismicity[J],2021,126(5).
APA	La Rosa A..,Pagli C..,Wang H..,Doubre C..,Leroy S..,...&Keir D..(2021).Plate-Boundary Kinematics of the Afrera Linkage Zone (Afar) From InSAR and Seismicity.Journal of Geophysical Research: Solid Earth,126(5).
MLA	La Rosa A.,et al."Plate-Boundary Kinematics of the Afrera Linkage Zone (Afar) From InSAR and Seismicity".Journal of Geophysical Research: Solid Earth 126.5(2021).